Check out the Don't Knock Twice Walkthrough to find details of how to win 28 Achievements from this game, worth a total of 1116 TrueAchievement points (1000 Gamerscore)

Official Site Review

The singular lasting impression of Don't Knock Twice is one of bewilderment that it somehow exists at all. A movie tie-in game for a limited release and poorly reviewed film that wrapped its quiet and brief theater tour over half a year ago is not the mark of something promising. Ultimately, the game is exactly what it appears to be: bare bones, forgettable, and not worth your time. Horror fans have too many better choices these days, and fans of first-person exploration games have a growing list of their own. Put Don't Knock Twice at the bottom of each of those lists and only get around to it when you've exhausted all other options.